<script setup>
import { userRegisterService, userLoginService } from '@/api/user.js'
import { useUserStore } from '@/stores'
import { User, Lock } from '@element-plus/icons-vue'
import { ref,watch } from 'vue'
import { useRouter } from 'vue-router'
const isRegister = ref(false)
const form = ref()
// 注册  整个的用于提交的form数据对象
const formModel = ref({
  username: '',
  password: '',
  repassword: ''
})
// 整个表单的校验规则  trigger: 'blur' 表示是输完校验 还是实时校验
// 1、非空校验 required：true message消息提示  trigger触发校验的时机 blur change 
// 2、长度校验 min max 
// 3、正则校验 pattern：正则规则 \S
// 4、自定义校验 => 自己写逻辑校验 (校验函数)  
//       validator: (rule,value,callback) 
//              rule 当前校验规则 相关的消息 
//              value 所校验的表单元素目前的表单值  
//              callback(无论成功还是失败，都需要callback 回调) => callback() 校验成功   callback(new Error(错误信息))校验失败
const rules = {
  username: [
    { required: true, message: '请输入用户名', trigger: 'blur' },
    { min: 5, max: 10, message: '用户名必须是5 - 10位的字符', trigger: 'blur'}
  ],
  password: [
    { required: true, message: '请输入密码', trigger: 'blur' },
    { pattern:/^\S{6,15}$/ ,message: '密码必须是6-15位的非空字符', trigger: 'blur'}
  ],
  repassword :[
      { required: true, message: '请输入密码', trigger: 'blur' },
    { pattern:/^\S{6,15}$/ ,message: '密码必须是6-15位的非空字符', trigger: 'blur'},
    { 
      validator: (rule,value,callback) => {
        // 判断 value 和当前 form 中收集的password 是否一致
        if (value !== formModel.value.password){
          callback(new Error('两次输入的密码不一致'))
        }else {
          callback() // 就算成功也需要callback
        }
    },
    trigger: 'blur'
  }
  ]
}
const register = async () => {
  // 注册成功之前，先进行校验，校验成功 -> 请求，校验失败 ->自动提示
  await form.value.validate() 
  await userRegisterService(formModel.value)
  ElMessage.success('注册成功')
  isRegister.value = false // 切换登录
}

const userStore = useUserStore()
const router = useRouter()
const login = async() => {
  // 预校验
  await form.value.validate()
  const res = await userLoginService(formModel.value)
  userStore.setToken(res.token)
  ElMessage.success('登录成功')
  router.push('/')
}

// 切换的时候重置表单的内容
watch(isRegister, () => {
  formModel.value = {
    username: '',
    password: '',
    repassword: ''
  }
})
</script>

<template>
  <!-- 
   1、结构相关
   el-row 表示一行, 一行分成24份
   el-col 表示列 :span="12" 表示在一行中占12份  :offset="3" 表示在一行中 左侧margin 份数
  el-form 整个表单组件
  el-form-item 表单的一行 (一个表单域)
  el-input 表单元素 (输入框)

  2、校验相关
     (1) el-form => :model="ruleForm" 绑定的整个数据对象    {xxx, xxx, xxx}
     (2) el-form => :rules="rules"    绑定的整个rules规则对象 {xxx, xxx, xxx}
     (3) 表单元素 => v-model="ruleForm.xxx" 给表单元素，绑定form的子属性
     (4) el-form-item => prop 配置生效的是哪个校验规则 (和rules中的字段要对应)
    -->
  <el-row class="login-page">
    <el-col :span="12" class="bg"></el-col>
    <el-col :span="6" :offset="3" class="form">
      <!-- 注册相关表单 -->
      <el-form 
          :model="formModel" 
          :rules="rules"
          ref="form" 
          size="large" 
          autocomplete="off"
          v-if="isRegister">
        <el-form-item>
          <h1>注册</h1>
        </el-form-item>
        <el-form-item prop="username">
          <el-input v-model="formModel.username" :prefix-icon="User" placeholder="请输入用户名"></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
          v-model="formModel.password"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入密码"
          ></el-input>
        </el-form-item>
        <el-form-item prop="repassword">
          <el-input
          v-model="formModel.repassword"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入再次密码"
          ></el-input>
        </el-form-item>
        <el-form-item>
          <el-button @click="register" class="button" type="primary" auto-insert-space>
            注册
          </el-button>
        </el-form-item>
        <el-form-item class="flex">
          <el-link type="info" :underline="false" @click="isRegister = false">
            ← 返回
          </el-link>
        </el-form-item>
      </el-form>
      <!-- 登录相关表单 -->
      <el-form :model="formModel" :rules="rules" ref="form" size="large" autocomplete="off" v-else>
        <el-form-item>
          <h1>登录</h1>
        </el-form-item>
        <el-form-item prop="username">
          <el-input v-model="formModel.username" :prefix-icon="User" placeholder="请输入用户名"></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
            v-model="formModel.password"
            name="password"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入密码"
          ></el-input>
        </el-form-item>
        <el-form-item class="flex">
          <div class="flex">
            <el-checkbox>记住我</el-checkbox>
            <el-link type="primary" :underline="false">忘记密码？</el-link>
          </div>
        </el-form-item>
        <el-form-item>
          <el-button @click="login" class="button" type="primary" auto-insert-space
            >登录</el-button
          >
        </el-form-item>
        <el-form-item class="flex">
          <el-link type="info" :underline="false" @click="isRegister = true">
            注册 →
          </el-link>
        </el-form-item>
      </el-form>
    </el-col>
  </el-row>
</template>

<style lang="scss" scoped>
.login-page {
  height: 100vh;
  background-color: #fff;
  .bg {
    background: url('@/assets/logo2.png') no-repeat 60% center / 240px auto,
      url('@/assets/login_bg.jpg') no-repeat center / cover;
    border-radius: 0 20px 20px 0;
  }
  .form {
    display: flex;
    flex-direction: column;
    justify-content: center;
    user-select: none;
    .title {
      margin: 0 auto;
    }
    .button {
      width: 100%;
    }
    .flex {
      width: 100%;
      display: flex;
      justify-content: space-between;
    }
  }
}
</style>